Maybe one of these similar products would be of interest:-

Granite Pestle only Replacement Pestle only Stone Unpolished Heavy Granite

6 in Granite Replacement Pestle (Only Pestle [Mortar is not Included]) White ...

Braun K1000 3210 Food Processor Preparation Center 5 in 1- REPLACEMENT PARTS

6 in Granite Pestle (Only Pestle [Mortar is not Included]) Black Polishing

6 in Granite Replacement Pestle (Only Pestle [Mortar is not Included]) White